Improving Nutrient Use Efficiency In Rice Through Coating Of Ferilizers
By: Divya ULK.
Contributor(s): Jose Mathew (Guide).
Material type:
BookPublisher: Vellanikkara Department of Agronomy, College of Horticulture 1999DDC classification: 630 Online resources: Click here to access online Dissertation note: MSc Abstract: A study was conducted during 1998-99 to investigate the effectiveness of
coating of diammonium phosphate and urea with different materials on the growth,
yield and nutrient use efficiencyin rice, which included an incubation study and a
field experiment.
The field experiment consisted of 15 treatment combinations involving
varying levels (100% and 75% of recommended dose) ofN and P supplied through
uncoated or coated (with neem extract or neem extract-resin mixture) diammonium
phosphate and urea. The incubation study included an additional treatment of
absolute control.
The results of the incubation study showed that the ammoniacal N, . nitrate
N and available P content in soil progressively increased up to 30 days of incubation
in the case of treatments receiving coated fertilizers, while the treatments receiving
uncoated fertilizser showed an increase only up to 10-15 days.
The effect of the treatments on yield and yield attributes was found to be
non-significant, except for the number of panicles m-2. However marginal.increase
in grain yield was observed in general in treatments receiving coated DAP.
With regard to nutrient uptake, the effect of treatments was significant at
all the three stages (active tillering, panicle initiation and harvest) in the case ofN,
at panicle initiation in the case ofP and at active tillering and panicle initiation stage
in the case of K. In general, coating was found to have positive influence on the
uptake ofN, P and K.
The positive influence of coating on the availability of N and P and its
uptake by the crop failed to reflect on grain yield. The increased uptake of Fe and
Mn by rice in the laterite soils may be the likely reason for the absence of response
to the treatments.
The overall result show that from the point of view of efficiency, coating
has a definite advantage and this advantage can be tapped in terms of production
only after eliminating the basic factors responsible for yield inhibition of rice grown
in laterite soils'.
| Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
Theses
|
KAU Central Library, Thrissur Theses | 630 DIV/IM (Browse shelf) | Available | 171549 |
MSc
A study was conducted during 1998-99 to investigate the effectiveness of
coating of diammonium phosphate and urea with different materials on the growth,
yield and nutrient use efficiencyin rice, which included an incubation study and a
field experiment.
The field experiment consisted of 15 treatment combinations involving
varying levels (100% and 75% of recommended dose) ofN and P supplied through
uncoated or coated (with neem extract or neem extract-resin mixture) diammonium
phosphate and urea. The incubation study included an additional treatment of
absolute control.
The results of the incubation study showed that the ammoniacal N, . nitrate
N and available P content in soil progressively increased up to 30 days of incubation
in the case of treatments receiving coated fertilizers, while the treatments receiving
uncoated fertilizser showed an increase only up to 10-15 days.
The effect of the treatments on yield and yield attributes was found to be
non-significant, except for the number of panicles m-2. However marginal.increase
in grain yield was observed in general in treatments receiving coated DAP.
With regard to nutrient uptake, the effect of treatments was significant at
all the three stages (active tillering, panicle initiation and harvest) in the case ofN,
at panicle initiation in the case ofP and at active tillering and panicle initiation stage
in the case of K. In general, coating was found to have positive influence on the
uptake ofN, P and K.
The positive influence of coating on the availability of N and P and its
uptake by the crop failed to reflect on grain yield. The increased uptake of Fe and
Mn by rice in the laterite soils may be the likely reason for the absence of response
to the treatments.
The overall result show that from the point of view of efficiency, coating
has a definite advantage and this advantage can be tapped in terms of production
only after eliminating the basic factors responsible for yield inhibition of rice grown
in laterite soils'.
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